Software corrupting other programs or the OS

A question for experts:
In the context of earlier serious corruption of my iMac (now cured) unconected with this utility, here is part of a conversation wirh a Mac software company whose site states that its product is not yet fully compatible with M.Lion:
Question: "How convinced are you that if I avoid the problem area, Snapz Pro X (Movie) will not corrupt my Mac?"
Answer: "I am convinced because software does not work that way. Everything is in its own little space. Just don't install the the AmbrosiaAudioSupport kernel extension (KEXT) and you won't have a problem."
I know that the Mac's OS has for some time had a feature whereby each program lives in its own area, protected from interference from other programs. But does this mean:
That the code for every (eg., application or utility) program is protected from corruption in another program;
Or that the whole OS is protected in that way?;
Or both?
The answer I got seems rather idealistic. Is it?
Thanks.

If that program isn't supported, don't install it. In Mountain Lion, Apple included sandboxing, and every app works so that doesn't affect to the other applications. The kext is an extension, and a problem with that can freeze Mountain Lion or that appears a kernel panic.
Apple has got all of their apps sandboxed, the same for the App Store. You can install Lion if you need the program

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